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2次方程式のプリント
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2次方程式
レベル2 · 解が整数
名前
組
方程式を解きなさい。
1.
x
2
−
9
x
+
8
=
0
x^{2} - 9x + 8 = 0
x
2
−
9
x
+
8
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
2.
x
2
−
2
x
−
24
=
0
x^{2} - 2x - 24 = 0
x
2
−
2
x
−
24
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
3.
x
2
−
6
x
−
27
=
0
x^{2} - 6x - 27 = 0
x
2
−
6
x
−
27
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
4.
x
2
+
12
x
+
27
=
0
x^{2} + 12x + 27 = 0
x
2
+
12
x
+
27
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
5.
x
2
+
5
x
+
6
=
0
x^{2} + 5x + 6 = 0
x
2
+
5
x
+
6
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
6.
x
2
+
5
x
−
6
=
0
x^{2} + 5x - 6 = 0
x
2
+
5
x
−
6
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
7.
x
2
−
2
x
−
15
=
0
x^{2} - 2x - 15 = 0
x
2
−
2
x
−
15
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
8.
x
2
+
3
x
+
2
=
0
x^{2} + 3x + 2 = 0
x
2
+
3
x
+
2
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
9.
x
2
−
11
x
=
0
x^{2} - 11x = 0
x
2
−
11
x
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
10.
x
2
+
10
x
=
0
x^{2} + 10x = 0
x
2
+
10
x
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
解答
2次方程式 · レベル2 · 解が整数
1.
x
1
=
1
,
x
2
=
8
x_1 = 1,\; x_2 = 8
x
1
=
1
,
x
2
=
8
2.
x
1
=
−
4
,
x
2
=
6
x_1 = -4,\; x_2 = 6
x
1
=
−
4
,
x
2
=
6
3.
x
1
=
−
3
,
x
2
=
9
x_1 = -3,\; x_2 = 9
x
1
=
−
3
,
x
2
=
9
4.
x
1
=
−
9
,
x
2
=
−
3
x_1 = -9,\; x_2 = -3
x
1
=
−
9
,
x
2
=
−
3
5.
x
1
=
−
2
,
x
2
=
−
3
x_1 = -2,\; x_2 = -3
x
1
=
−
2
,
x
2
=
−
3
6.
x
1
=
1
,
x
2
=
−
6
x_1 = 1,\; x_2 = -6
x
1
=
1
,
x
2
=
−
6
7.
x
1
=
−
3
,
x
2
=
5
x_1 = -3,\; x_2 = 5
x
1
=
−
3
,
x
2
=
5
8.
x
1
=
−
2
,
x
2
=
−
1
x_1 = -2,\; x_2 = -1
x
1
=
−
2
,
x
2
=
−
1
9.
x
1
=
0
,
x
2
=
11
x_1 = 0,\; x_2 = 11
x
1
=
0
,
x
2
=
11
10.
x
1
=
0
,
x
2
=
−
10
x_1 = 0,\; x_2 = -10
x
1
=
0
,
x
2
=
−
10
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